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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 903 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.31² =
  2. 2.61² =
  3. 3.19² =
  4. 4.89² =
  5. 5.79² =
  6. 6.61² =
  7. 7.49² =
  8. 8.59² =
  9. 9.69² =
  10. 10.21² =
  11. 11.19² =
  12. 12.29² =
  13. 13.21² =
  14. 14.21² =
  15. 15.51² =
  16. 16.19² =
  17. 17.39² =
  18. 18.59² =
  19. 19.31² =
  20. 20.69² =
  21. 21.31² =
  22. 22.49² =
  23. 23.29² =
  24. 24.71² =
  25. 25.59² =
  26. 26.49² =
  27. 27.81² =
  28. 28.21² =
  29. 29.89² =
  30. 30.59² =
  31. 31.19² =
  32. 32.29² =
  33. 33.41² =
  34. 34.61² =
  35. 35.21² =
  36. 36.49² =
  37. 37.69² =
  38. 38.21² =
  39. 39.49² =
  40. 40.51² =

Answer key

  1. 961
  2. 3721
  3. 361
  4. 7921
  5. 6241
  6. 3721
  7. 2401
  8. 3481
  9. 4761
  10. 441
  11. 361
  12. 841
  13. 441
  14. 441
  15. 2601
  16. 361
  17. 1521
  18. 3481
  19. 961
  20. 4761
  21. 961
  22. 2401
  23. 841
  24. 5041
  25. 3481
  26. 2401
  27. 6561
  28. 441
  29. 7921
  30. 3481
  31. 361
  32. 841
  33. 1681
  34. 3721
  35. 441
  36. 2401
  37. 4761
  38. 441
  39. 2401
  40. 2601

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